In designing a printed circuit board, first and second copies of views of first and second major surfaces of the board respectively, are created. The first and second copies are positioned to contact each other. First and second segments on a side of the printed circuit board and normal to a first element in the first copy and a second element in the second copy respectively are obtained. A third segment joining ends of the first and second segments is obtained, and a point dividing the third segment according to a ratio of a distance from the first element to the side and a distance from the second element to the side is calculated. Distances from the first element to the point and from the point to the second element are calculated, and a creepage distance, a sum of the two distances and a thickness of the board, is obtained.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method executed by a computer for supporting design of a printed circuit board comprising: creating, by the computer, a first copy of a view of a first major surface and a second copy of a plan view of a second major surface of the printed circuit board respectively, the first copy and the second copy being placed side by side so that the first copy and the second copy contact each other, the printed circuit board being for mounting a plurality of elements disposed on the first major and the second major surfaces; obtaining a first line segment on a first side corresponding to a side of the printed circuit board, the first line segment being projected normal onto the first side from a first element, the first element being one of the elements appearing in the first copy; obtaining a second line segment on the first side, the second line segment being projected normal onto the first side from a second element, the second element being one of the elements appearing in the second copy; obtaining a third line segment, the third line segment being a line having two ends, one of the two ends being an end of the first line segment, another of the two ends being an end of the second line segment, the end of the first line segment and the end of the second line segment being adjacent each other; dividing the third line segment into a ratio of a distance from the first element to the first side and a distance from the second element to the first side; obtaining a point on the third line segment, the point dividing the third line segment by the ratio; calculating two distances, one of the two distances being from the first element to the point, the other of the two distances being from the point to the second element; and obtaining a creepage distance between the first and the second elements, the creepage distance being a sum of the two distances and a thickness of the printed circuit board.
2. An apparatus for supporting design of a printed circuit board comprising: a creator configured to create a first copy of a view of a first major surface and a second copy of a plan view of a second major surface of the printed circuit board respectively, the first copy and the second copy being placed side by side so that the first copy and the second copy contact each other, the printed circuit board for mounting a plurality of elements disposed on the first major and the second major surfaces; a first obtainer configured to obtain a first line segment on a first side corresponding to a side of the printed circuit board, the first line segment being projected normal onto the first side from a first element, the first element being one of the elements appearing in the first copy; a second obtainer configured to obtain a second line segment on the first side, the second line segment being projected normal onto the first side from a second element, the second element being one of the elements appearing in the second copy; a third obtainer configured to obtain a third line segment, the third line segment being a line having two ends, one of the two ends being an end of the first line segment, another of the two ends being an end of the second line segment, the end of the first line segment and the end of the second line segment being adjacent each other; a divider configured to divide the third line segment into a ratio of a distance from the first element to the first side and a distance from the second element to the first side; a fourth obtainer configured to obtain a point on the third line segment, the point dividing the third line segment by the ratio; a calculator configured to calculate two distances, one of the two distances being from the first element to the point, the other of the two distances being from the point to the second element; and a fifth obtainer configured to obtain a creepage distance between the first and the second elements, the creepage distance being a sum of the two distances and a thickness of the printed circuit board.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
December 27, 2010
July 19, 2011
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